Question: What is the toughest stainless steel used in the chemical industry ?
Paraphrase: Name the strongest stainless steel currently used in the chemical industry.
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q172587 . ?ent wdt:P5520 ?obj . ?ent wdt:P366 wd:Q207652 } ORDER BY DESC(?obj)LIMIT 5